I'd like to modulate the temperature of a cabin. If I put plastic or PEX pipes under the flooring and run the shallow well pump continuously, will that work? I'd return the water to the well after the heat transfer. If it might work, where can I find heat loss tables to determine the type/size of pipes needed (e.g., with a 30 degree air-water difference, a 3/4" inch plastic pipe looses 1-degree every 10 feet)?